Omron MS4800E, Operation Manual

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14
Fixed Blanking with Floating Blanking
Section 5-3
5-3 Fixed Blanking with Floating Blanking
!WARNING
Use of Fixed Blanking and Floating Blanking will make MS4800 system less
sensitive to objects in the detection zone. Improper use of these features can
result in severe injury to personnel. Fixed Blanking may require a hard barrier
guard. Fixed Blanking and Floating Blanking may require an increase in the
safety distance. Read the following section carefully.
Possible combinations:
When both Fixed Blanking and Floating Blanking are selected, the floating
channels are allowed to occur anywhere within the detection zone except the
area selected by Fixed Blanking.
5-3-1 The effect of Fixed or Floating Blanking on minimum object
resolution
When fixed Blanking and/or Floating are active, the safe mounting distance is
affected. Fixed and Floating Blanking desensitize the light curtain and
increase the size of the minimum detectable object. The increase is equal to
the beam spacing distance for each beam that is disabled.
If the size of the object detected by the system increases the minimum safe
distance must also be increased. Use the minimum object sensitivity given in
the following tables to determine the new figure to use when computing the
safety distance.
MS4800 system - 14 mm resolution
MS4800 system - 30mm resolution
Function Fixed Blanking Floating Blanking
Fixed Blanking N/A Yes
Floating Blanking Yes N/A
Total number of Beams Disabled by
Fixed and/or Floating Blanking
Effective Resolution
None 14 mm
1 Beam 24 mm
2 Beams 34 mm
3 Beams 44 mm
4 Beams 54 mm
5 Beams 64 mm
> 64 mm
Total number of Beams Disabled by
Fixed and/or Floating Blanking
Effective Resolution
None 30 mm
1 Beam 50 mm
> 64mm